Scientists invent robot that eats organic matter, then poops it out

The first prototype invented by the Bristol Lab, Ecobot, was equipped with a microbial fuel cell that was powered by E. coli bacteria that fed on refined sugar. The second prototype, Ecobot-II, harnessed sludge microbes to break down dead flies, prawn shells and rotten apples. Soon, though, scientists recognized they had a problem: waste. These early prototypes had no way of dumping their leftover waste, eventually becoming "poisoned" by their own filth. This concern is what led to the current model, Ecobot-III.